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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Revenues:
Product	$ 3,654.6us-gaap_SalesRevenueGoodsNet	$ 3,943.9us-gaap_SalesRevenueGoodsNet	$ 4,092.3us-gaap_SalesRevenueGoodsNet
Software maintenance	898.6ntap_SoftwareMaintenanceRevenues	914.8ntap_SoftwareMaintenanceRevenues	893.5ntap_SoftwareMaintenanceRevenues
Hardware maintenance and other services	1,569.5ntap_HardwareMaintenanceAndOtherServicesRevenues	1,466.4ntap_HardwareMaintenanceAndOtherServicesRevenues	1,346.6ntap_HardwareMaintenanceAndOtherServicesRevenues
Net revenues	6,122.7us-gaap_SalesRevenueNet	6,325.1us-gaap_SalesRevenueNet	6,332.4us-gaap_SalesRevenueNet
Cost of revenues:
Cost of product	1,656.9us-gaap_CostOfGoodsSold	1,777.1us-gaap_CostOfGoodsSold	1,959.9us-gaap_CostOfGoodsSold
Cost of software maintenance	35.7ntap_CostOfSoftwareMaintenance	30.7ntap_CostOfSoftwareMaintenance	28.3ntap_CostOfSoftwareMaintenance
Cost of hardware maintenance and other services	596.9ntap_CostOfHardwareMaintenanceAndOtherServices	598.2ntap_CostOfHardwareMaintenanceAndOtherServices	583.1ntap_CostOfHardwareMaintenanceAndOtherServices
Total cost of revenues	2,289.5us-gaap_CostOfRevenue	2,406.0us-gaap_CostOfRevenue	2,571.3us-gaap_CostOfRevenue
Gross profit	3,833.2us-gaap_GrossProfit	3,919.1us-gaap_GrossProfit	3,761.1us-gaap_GrossProfit
Operating expenses:
Sales and marketing	1,913.2us-gaap_SellingAndMarketingExpense	1,898.2us-gaap_SellingAndMarketingExpense	1,974.8us-gaap_SellingAndMarketingExpense
Research and development	919.3us-gaap_ResearchAndDevelopmentExpense	917.3us-gaap_ResearchAndDevelopmentExpense	904.2us-gaap_ResearchAndDevelopmentExpense
General and administrative	284.2us-gaap_GeneralAndAdministrativeExpense	281.0us-gaap_GeneralAndAdministrativeExpense	272.6us-gaap_GeneralAndAdministrativeExpense
Restructuring and other charges	0us-gaap_RestructuringCharges	88.3us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Acquisition-related expense	0us-gaap_BusinessCombinationIntegrationRelatedCosts	0us-gaap_BusinessCombinationIntegrationRelatedCosts	1.7us-gaap_BusinessCombinationIntegrationRelatedCosts
Total operating expenses	3,116.7us-gaap_OperatingExpenses	3,184.8us-gaap_OperatingExpenses	3,153.3us-gaap_OperatingExpenses
Income from operations	716.5us-gaap_OperatingIncomeLoss	734.3us-gaap_OperatingIncomeLoss	607.8us-gaap_OperatingIncomeLoss
Other income (expense), net	(3.7)us-gaap_NonoperatingIncomeExpense	6.4us-gaap_NonoperatingIncomeExpense	(41.2)us-gaap_NonoperatingIncomeExpense
Income before income taxes	712.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	740.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	566.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	152.9us-gaap_IncomeTaxExpenseBenefit	103.2us-gaap_IncomeTaxExpenseBenefit	61.3us-gaap_IncomeTaxExpenseBenefit
Net income	$ 559.9us-gaap_NetIncomeLoss	$ 637.5us-gaap_NetIncomeLoss	$ 505.3us-gaap_NetIncomeLoss
Net income per share:
Basic	$ 1.77us-gaap_EarningsPerShareBasic	$ 1.87us-gaap_EarningsPerShareBasic	$ 1.40us-gaap_EarningsPerShareBasic
Diluted	$ 1.75us-gaap_EarningsPerShareDiluted	$ 1.83us-gaap_EarningsPerShareDiluted	$ 1.37us-gaap_EarningsPerShareDiluted
Shares used in net income per share calculations:
Basic	315.5us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	340.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	361.5us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	320.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	347.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	368.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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